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Old 06-17-2013, 02:15 AM   #10
chasbmw
Beastly Adventurer
 
Joined: Feb 2006
Location: Bath Uk
Oddometer: 1,526
On my 90/6, with 14mm dual plugs, I use hotter running plugs on the bottom as an anti fouling measure, using iridiums on the 90/6 and NGKs on the 1070. The 90/6 was using a bit of oil as the rings did not bed in properly first time round, so last winter had the cylinders lightly glaze busted. Seems better now.

Jim Cray who did the work and is the main man for dual plug setups in the UK, told me straight that he has never had any head cracking problems by using 14mm lower plugs.
__________________
Charles
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R90s 1070 replica, R90/6
1971 Commando Fastback
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